Patents by Inventor Keiichi Betsui

Keiichi Betsui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10281272
    Abstract: Provided is a technology which is suitable for both widening an image capture view angle and securing an angular resolution across the entire image capture range. In an imaging optical system, a rate of change of an image height per view angle, i.e. dy/d?, is greater than 0 at a maximum view angle ?max, a rate of change of a view angle per image height, i.e. D(?)=1/(dy(?)/d?), satisfies an expression D(?p)>{(D(?max)?D(0))/?max?}?p+D(0), with ?p which lies in a range of 0<?<?max, and it satisfies an expression 1.5<(y(?s)/?s)/{(y(?max)?y(?s))/(?max??s)}<3.0 with a switching view angle ?s of the rate of change D(?) of the view angle per image height.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: May 7, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Seiji Murata, Keiichi Betsui
  • Patent number: 10026158
    Abstract: The present invention addresses the problem of providing an imaging device that prevents mismatching in image matching for parallax calculation even if the sharpnesses of an end part and center part of a processing area differ. An imaging device 1 according to the present invention is provided with a means for equalizing the sharpnesses of the processing areas of a reference image and a comparison image.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: July 17, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshiyuki Aoki, Takeshi Shima, Tatsuhiko Monji, Hiroshi Kuroda, Keiichi Betsui, Seiji Murata
  • Publication number: 20180150949
    Abstract: An image processing device processes an image captured by at least one image-capturing device including a lens which has characteristics of including an inflection point of a change rate of an incidence angle per image height with respect to the incidence angle at a predetermined inflection point incidence angle. The image processing device includes a resolution adjustment unit that adjusts resolution of an inflection point correspondence image area corresponding to the predetermined inflection point incidence angle and resolution of at least one of an inside image area positioned more inside than the inflection point correspondence image area and an outside image area positioned outside of the inflection point correspondence image area.
    Type: Application
    Filed: April 13, 2016
    Publication date: May 31, 2018
    Inventors: Haruki MATONO, Takeshi NAGASAKI, Toshiyuki AOKI, Seiji MURATA, Masayuki TAKEMURA, Keiichi BETSUI
  • Publication number: 20180017768
    Abstract: The imaging lens ensures the wide shooting view angle, and required angular resolution over the entire shooting range. The imaging lens includes at least a first lens and a second lens. The first lens has a first surface on which a principal light beam is made incidence, and a second surface from which the principal light beam is emitted. The second lens has a third surface on which the principal light beam emitted from the first lens is made incidence, and a fourth surface from which the principal light beam is emitted. Upon incidence of the principal light beam on the first lens, an incident angle ?n at which the principal light beam is made incidence on the first surface at right angles is allowed to be positioned other than a center of the first surface.
    Type: Application
    Filed: January 18, 2016
    Publication date: January 18, 2018
    Applicant: HITACHI, LTD.
    Inventors: Keiichi BETSUI, Seiji MURATA
  • Publication number: 20170314917
    Abstract: Provided is a technology which is suitable for both widening an image capture view angle and securing an angular resolution across the entire image capture range. In an imaging optical system, a rate of change of an image height per view angle, i.e. dy/d?, is greater than 0 at a maximum view angle ?max, a rate of change of a view angle per image height, i.e. D(?)=1/(dy(?)/d?), satisfies an expression D(?p)>{(D(?max)?D(0))/?max?}?p+D(0), with ?p which lies in a range of 0<?<?max, and it satisfies an expression 1.5<(y(?s)/?s)/{(y(?max)?y(?s))/(?max??s)}<3.0 with a switching view angle ?s of the rate of change D(?) of the view angle per image height.
    Type: Application
    Filed: October 27, 2015
    Publication date: November 2, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Seiji MURATA, Keiichi BETSUI
  • Publication number: 20170221188
    Abstract: The present invention addresses the problem of providing an imaging device that prevents mismatching in image matching for parallax calculation even if the sharpnesses of an end part and center part of a processing area differ. An imaging device 1 according to the present invention is provided with a means for equalizing the sharpnesses of the processing areas of a reference image and a comparison image.
    Type: Application
    Filed: August 17, 2015
    Publication date: August 3, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshiyuki AOKI, Takeshi SHIMA, Tatsuhiko MONJI, Hiroshi KURODA, Keiichi BETSUI, Seiji MURATA
  • Patent number: 9459448
    Abstract: A beam scanning type display apparatus includes a reflection angle variable mirror that scans a beam light, at least two light detectors disposed at a predetermined distance in a beam scanning direction of the mirror that detects a light amount of screen reflection light, a distortion correction calculation unit that obtains a drive correction value of the mirror by calculating an irradiation distance and a screen inclination, from a light amount of a reflection light detected by the light detectors at two different scanning timings and an inclination angle of the mirror at this time, and a mirror driving unit that controls an inclination angle of the mirror by the drive correction value. A drive correction value of the mirror driving unit is obtained at a plurality of timings of a scanning period of beam light, and beam light is scanned at the corrected inclination angle of the mirror.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: October 4, 2016
    Assignee: HITACHI MAXELL, LTD.
    Inventors: Shoji Yamamoto, Yoshiho Seo, Keiichi Betsui
  • Publication number: 20140240808
    Abstract: A beam scanning type display apparatus includes a reflection angle variable mirror that scans a beam light, at least two light detectors disposed at a predetermined distance in a beam scanning direction of the mirror that detects a light amount of screen reflection light, a distortion correction calculation unit that obtains a drive correction value of the mirror by calculating an irradiation distance and a screen inclination, from a light amount of a reflection light detected by the light detectors at two different scanning timings and an inclination angle of the mirror at this time, and a mirror driving unit that controls an inclination angle of the mirror by the drive correction value. A drive correction value of the mirror driving unit is obtained at a plurality of timings of a scanning period of beam light, and beam light is scanned at the corrected inclination angle of the mirror.
    Type: Application
    Filed: December 13, 2013
    Publication date: August 28, 2014
    Applicant: HITACHI MAXELL, LTD.
    Inventors: Shoji YAMAMOTO, Yoshiho SEO, Keiichi BETSUI
  • Patent number: 8692463
    Abstract: A protective film (6) having a high secondary-emission coefficient is formed on a dielectric layer (5) so as to lower the discharge voltage of a plasma display panel. When the protective film (6) is exposed to the air, it will transform or become cloudy, or the secondary-emission coefficient will lower. To prevent this problem, an inert film (60) is formed on the surface of the protective film (6). As the inert film (60), a film of a metal oxide such as SiO2 and a film of a metal such as Tb are simultaneously formed. Thus, an inert film (60) excellent in barrier property against oxygen and water in the air and enabling easy sputtering from near the discharge electrode at the aging step can be obtained. With this, a plasma display panel exhibiting a low discharge voltage can be realized.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: April 8, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Minoru Hasegawa, Shinya Fukuta, Keiichi Betsui, Yasunobu Hashimoto
  • Patent number: 8658988
    Abstract: A three-dimensional image projector, including a transparent display medium within which fluorescent substances are dispersed, the fluorescent substances being dispersed for performing the fluorescent light-emission of visible light by the irradiation with a laser beam of invisible light, a first-laser-beam scanning unit for scanning the inside of the transparent display medium by deflecting a first laser beam, the first laser beam being used for exciting the fluorescent substances, and a second-laser-beam scanning unit for scanning the inside of the transparent display medium by deflecting a second laser beam, the second laser beam being used for exciting the fluorescent substances, wherein a stereoscopic image is formed at a scanning intersection point of the first laser beam and the second laser beam inside the transparent display medium.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: February 25, 2014
    Assignee: Hitachi Consumer Electronics Co., Inc.
    Inventor: Keiichi Betsui
  • Publication number: 20130341508
    Abstract: A three-dimensional image projector, including a transparent display medium within which fluorescent substances are dispersed, the fluorescent substances being dispersed for performing the fluorescent light-emission of visible light by the irradiation with a laser beam of invisible light, a first-laser-beam scanning unit for scanning the inside of the transparent display medium by deflecting a first laser beam, the first laser beam being used for exciting the fluorescent substances, and a second-laser-beam scanning unit for scanning the inside of the transparent display medium by deflecting a second laser beam, the second laser beam being used for exciting the fluorescent substances, wherein a stereoscopic image is formed at a scanning intersection point of the first laser beam and the second laser beam inside the transparent display medium.
    Type: Application
    Filed: April 26, 2013
    Publication date: December 26, 2013
    Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.
    Inventor: Keiichi BETSUI
  • Patent number: 8564514
    Abstract: In a liquid crystal display device that uses a liquid crystal material having spontaneous polarization and is actively driven by a TFT, a voltage corresponding to image data is applied twice by driving the TFT of each pixel electrode on a line by line basis of a liquid crystal panel, during writing in one frame. During erasure in one frame, voltage application to liquid crystal by batch selection of all the pixel electrodes is performed three times. With this three times of voltage application, it is possible to achieve a black display state in each pixel and make the stored charge amount at the liquid crystal in each pixel substantially zero.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: October 22, 2013
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Shinji Tadaki, Tetsuya Makino, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui
  • Patent number: 8466861
    Abstract: A liquid crystal display device displays an image by stacking a plurality of liquid crystal panels, and by controlling a light transmittance with voltage application to liquid crystal of each panel, wherein during execution of voltage application to the liquid crystal of one of the panels, a voltage to the liquid crystal of the other panel serves as a non-display voltage. No image is displayed simultaneously on the two or more stacked liquid crystal panels. In the liquid crystal panel to which no voltage is applied and on which no image is displayed, the longitudinal axial direction of liquid crystal molecules coincides with the polarizing axial direction of polarizers, or is orthogonal to the polarizing axial direction; therefore, no influence is exerted on the overall double refraction, and the overall voltage-transmitted light intensity characteristic corresponds to the sum of the voltage-transmitted light intensity characteristics of the respective panels.
    Type: Grant
    Filed: April 1, 2008
    Date of Patent: June 18, 2013
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Shinji Tadaki, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui
  • Patent number: 8253674
    Abstract: A liquid crystal panel includes a glass substrate with pixel electrodes that are arranged in a matrix shape, TFTs that are connected to the pixel electrodes, and a glass substrate with an opposing electrode and color filters that are arranged in a matrix shape. A liquid crystal layer is formed in a space between the glass substrates by filling a ferroelectric liquid crystal into the space. When writing display data, and when deleting display data that has been written, a voltage, not including 0V, that becomes a voltage potential, or in other words, a voltage that is greater than a threshold voltage at which the optical characteristic of the filled ferroelectric liquid crystal changes is applied between the opposing electrode and pixel electrodes. An image is displayed over all gradation numbers, including the low-gradation side, and the display characteristic is improved.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: August 28, 2012
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Makino, Toshiaki Yoshihara, Shinji Tadaki, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui
  • Patent number: 8207672
    Abstract: A technique for achieving both discharge voltage reduction and discharge stabilization in a PDP and the like is provided. This PDP manufacturing method includes, for a structure of a front plate structure (11) to be exposed to a discharge space (30) to be filled with a discharge gas, a step of forming a first layer (4) having an effect of discharge protective layer on a dielectric layer (3), a step of forming a second layer (5) for protecting the first layer on the first layer, and a step of forming a third layer (6) of a powder for discharge stabilization to be exposed to the discharge space (30), the steps being performed in vacuum manufacturing process. And, the structure is made such that a surface of the first layer is exposed to the discharge space (30) by a step of removing the second layer by an aging discharge in the discharge space (30).
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: June 26, 2012
    Assignee: Hitachi, Ltd
    Inventors: Keiichi Betsui, Shinya Fukuta, Tadayoshi Kosaka, Minoru Hasegawa, Hajime Inoue, Yoshiho Seo, Tomonari Misawa
  • Patent number: 8044901
    Abstract: When the applied voltages are 7 V and 5 V, a transmittance of equal to or more than 50% is obtained when conditions of |2Ps·A|?|7Clc·A| and |2Ps·A|?|5Clc·A| are satisfied among the magnitude Ps (nC/cm2) of the spontaneous polarization per unit area of the liquid crystal material, the electrode area A (cm2) of the pixels and the capacity of liquid crystal Clc (nF/cm2) per unit area, and a transmittance of equal to or more than 80% is obtained when conditions of |2Ps·A|?|4.5Clc·A| and |2Ps·A|?|3Clc·A| are satisfied thereamong. A sufficiently high transmittance is obtained without the provision of a storage capacitor.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: October 25, 2011
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Shinji Tadaki, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui
  • Patent number: 8009249
    Abstract: In a liquid crystal display device that carries out image display using multiple liquid crystal panels stacked, the average change in the direction of the optical axis due to the response of liquid crystal molecules with respect to the applied voltage, that is, the change in the direction of the long axis of the liquid crystal molecules with respect to the applied voltage, is made different among the liquid crystal panels. The desired brightness is attained at the overlaid portion of the liquid crystal panels.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: August 30, 2011
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Keiichi Betsui
  • Publication number: 20110018786
    Abstract: There is provided a technique for discharge stabilization of a plasma display panel by forming magnesium oxide with a large diameter and adjusting residual amounts of impurities contained in the magnesium oxide. That is, discharge stabilization material particle, which is coated on a protective-film layer of protecting electrodes and supplies sufficient amount of priming particles into a discharge gap, is focused. By setting each impurity concentration in the magnesium oxide used as the discharge stabilization material particle to 20 ppm or lower, discharge time lag is suppressed.
    Type: Application
    Filed: April 7, 2008
    Publication date: January 27, 2011
    Inventors: Keiichi Betsui, Tomonari Misawa, Tadayoshi Kosaka, Yoshiho Seo, Hajime Inoue, Shinya Fukuta, Minoru Hasegawa
  • Publication number: 20110001427
    Abstract: A technique for achieving both discharge voltage reduction and discharge stabilization in a PDP and the like is provided. This PDP manufacturing method includes, for a structure of a front plate structure (11) to be exposed to a discharge space (30) to be filled with a discharge gas, a step of forming a first layer (4) having an effect of discharge protective layer on a dielectric layer (3), a step of forming a second layer (5) for protecting the first layer on the first layer, and a step of forming a third layer (6) of a powder for discharge stabilization to be exposed to the discharge space (30), the steps being performed in vacuum manufacturing process. And, the structure is made such that a surface of the first layer is exposed to the discharge space (30) by a step of removing the second layer by an aging discharge in the discharge space (30).
    Type: Application
    Filed: October 2, 2007
    Publication date: January 6, 2011
    Applicant: HITACHI, LTD.
    Inventors: Keiichi Betsui, Shinya Fukuta, Tadayoshi Kosaka, Minoru Hasegawa, Hajime Inoue, Yoshiho Seo, Tomonari Misawa
  • Patent number: 7847913
    Abstract: A liquid crystal material is used in which the maximum angle of the optical axis change by liquid crystal molecule when a voltage of one polarity is applied is larger than 45 degrees and a condition of |2Ps·A|>|5(V)Clc·A| is satisfied where Ps (nC/cm2) is the magnitude of the spontaneous polarization per unit area, A (cm2) is the electrode area of the pixel and Clc (nF/cm2) is the liquid crystal capacity per unit area. The transmittance in the liquid crystal part is increased and excellent display can be performed without the provision of a storage capacitor. Consequently, the storage capacitor is unnecessary, so that the aperture ratio of the liquid crystal panel can be increased.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: December 7, 2010
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Shinji Tadaki, Hironori Shiroto, Yoshinori Kiyota, Keiichi Betsui